docs: def ToABMag(self, wave, flux, **kwargs):
          """Convert to ``abmag``.
  
          .. math::
  
              \\textnormal{AB}_{\\nu} = -2.5 \\; \\log(h \\lambda \\; \\textnormal{photlam}) - 48.6
  
          where :math:`h` is as defined in :ref:`pysynphot-constants`.
  
          Parameters
          ----------
          wave, flux : number or array_like
              Wavelength and flux values to be used for conversion.
  
          kwargs : dict
              Extra keywords (not used).
  
          Returns
          -------
          result : number or array_like
              Converted values.
  
          """
          arg = H * flux * wave
          return -1.085736 * N.log(arg) + ABZERO